C12313211232233312111111312111133133313331323133313333232233221122331231   >>    C1231321123223331211111131211113313331333132313331333323223322112233123   <<    C12313211232233312111111312111133133313331323133313333232233221122331233   >>      C12313211232233312111111312111133133313331323133313333232233221122331232   >>